1998 cheverolet blazer 4×4

HELP!!!!!!!!!!!!4×4 chevy blazer has a situation of crank but no start. i tried to fix it. replaced the crankshaft position sensor and set the time of the distributor. replaced the coil pack, replaced the distributor cap and button. spark plugs are good, battery good, fuses are good. good fuel flow. computer diagnostic shows no codes.

1998